Anomalous low-temperature enhancement of supercurrent in topological-insulator nanoribbon Josephson junctions: evidence for low-energy Andreev bound states
| Autor: | Mehdi Kargarian, Victor M. Yakovenko, Aleksandr Kazakov, Ireneusz Miotkowski, Morteza Kayyalha, Leonid P. Rokhinson, Victor Galitski, Yong P. Chen |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Superconductivity Josephson effect Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity Supercurrent FOS: Physical sciences General Physics and Astronomy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Superconductivity (cond-mat.supr-con) symbols.namesake Topological insulator Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Boltzmann constant Bound state symbols 010306 general physics Wave function Order of magnitude |
| Popis: | We report anomalous enhancement of the critical current at low temperatures in gate-tunable Josephson junctions made from topological insulator BiSbTeSe$_2$ nanoribbons with superconducting Nb electrodes. In contrast to conventional junctions, as a function of the decreasing temperature $T$, the increasing critical current $I_c$ exhibits a sharp upturn at a temperature $T_*$ around 20$\%$ of the junction critical temperatures for several different samples and various gate voltages. The $I_c$ vs. $T$ demonstrates a short junction behavior for $T>T_*$, but crosses over to a long junction behavior for $T |
| Databáze: | OpenAIRE |
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